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公开(公告)号：US09207129B2
公开(公告)日：2015-12-08
申请号：US13629127
申请日：2012-09-27
Applicant: Rosemount Inc.
Inventor： Jason H. Rud
Abstract: A preexisting voltage across a sensor is latched to a storage capacitor prior to any excitation current being applied to the sensor. Once the excitation current is applied, the voltage on the storage capacitor is directly subtracted from a differential voltage across the sensor. The subtraction is done before a measurement is converted to a digital value and passed to a transmitter. The subtraction is performed in hardware, and a time required to sample and hold the preexisting voltage across the storage capacitor is within a settling time used for collecting any sensor measurements.
Abstract translation: 在任何激励电流施加到传感器之前，传感器上的预先存在的电压被锁存到存储电容器。 一旦施加了激励电流，就会从传感器上的差分电压直接减去存储电容上的电压。 在将测量值转换为数字值并传送到发射机之前进行减法。 减法在硬件中执行，并且在存储电容器之间采样和保持预先存在的电压所需的时间在用于收集任何传感器测量值的建立时间内。
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公开(公告)号：US20140241399A1
公开(公告)日：2014-08-28
申请号：US13775848
申请日：2013-02-25
Applicant: ROSEMOUNT INC.
Inventor： Jason H. Rud
CPC classification number: G01K15/007 , G01K1/024 , G01K7/20
Abstract: A process temperature transmitter is operable with at least one temperature sensor having a plurality of leads. The temperature transmitter includes measurement circuitry operably coupleable to the at least one temperature sensor to provide an indication of an electrical parameter of the at least one temperature sensor. A controller is coupled to the measurement circuitry to obtain the indication and provide a process temperature output. A current source applies a test current to the plurality of leads simultaneously. Diagnostic circuitry measures a voltage response on each lead in order to provide a diagnostic indication of the temperature sensor.
Abstract translation: 过程温度变送器可操作与具有多个引线的至少一个温度传感器。 温度传感器包括可操作地耦合到至少一个温度传感器的测量电路，以提供至少一个温度传感器的电参数的指示。 控制器耦合到测量电路以获得指示并提供过程温度输出。 电流源同时对多个引线施加测试电流。 诊断电路测量每个引线上的电压响应，以便提供温度传感器的诊断指示。
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